WORST CUSTOMER SERVICE

We have a Daihatsu vehicle that needed a service. I phoned Kia Menlyn and booked the vehicle. Giving the address that shows on Google to my driver. When he arrived at the address it was not the correct address but they serviced our vehicle anyway. After numerous calls with the different supplier to ensure we keep our service plan I phoned Kia and could never speak to any manager. I then spoke to one of the managers assistants.. He was very helpful at first and tried to speak to the supplier of the maintenance plan. He then coresponded over email saying we need to bring in the vehicle ASAP. First I explained to him it is a company vehicle and can't be at the workshop that quickly. Afterwards we tried to make plan to book it. I corresponded with the assistant to try and find out how long we need to leave the vehicle there and if early the next morning is okay. I never received any response from this assistant again and he never answers my calls. Our vehicle needs to be sorted out and the service added onto Kia's system but we receive no help at all and also no feedback and we refuse to lose the maintenance plan because they can't answer calls or emails to assist the clients.